Parametric excitation in a magnetic tunnel junction-based spin torque oscillator

被引：17

作者：

Durrenfeld, P. ^{[1
]}

Iacocca, E. ^{[1
]}

Akerman, J. ^{[1
,2
]}

Muduli, P. K. ^{[1
,3
]}

机构：

[1] Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden

[2] KTH Royal Inst Technol, Sch ICT, S-16440 Kista, Sweden

[3] Indian Inst Technol, Dept Phys, New Delhi 110016, India

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 05期

基金：

瑞典研究理事会;

关键词：

PHASE-LOCKING; NANO-OSCILLATORS; DRIVEN; MULTILAYERS; MODULATION; WAVES;

D O I：

10.1063/1.4864166

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using microwave current injection at room temperature, we demonstrate parametric excitation of a magnetic tunnel junction (MTJ)-based spin-torque oscillator (STO). Parametric excitation is observed for currents below the auto-oscillation threshold, when the microwave current frequency f(e) is twice the STO free-running frequency f(0). Above threshold, the MTJ becomes parametrically synchronized. In the synchronized state, the STO exhibits an integrated power up to 5 times higher and a linewidth reduction of two orders of magnitude, compared to free-running conditions. We also show that the parametric synchronization favors single mode oscillations in the case of multimode excitation. (C) 2014 AIP Publishing LLC.

引用

页数：4

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